netdev - Re: [PATCH net-next v2] IPv6: add option to use Subnet-Router anycast addresses as source addresses

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Message-ID: <20140102231921.GI22494@order.stressinduktion.org>
Date:	Fri, 3 Jan 2014 00:19:21 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	François-Xavier Le Bail <fx.lebail@...oo.com>,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next v2] IPv6: add option to use Subnet-Router anycast addresses as source addresses

On Fri, Jan 03, 2014 at 12:17:30AM +0100, Hannes Frederic Sowa wrote:
> On Thu, Jan 02, 2014 at 10:56:17AM -0800, François-Xavier Le Bail wrote:
> > > I wouldn't actually add this knob, we can just enable that by default.
> > 
> > I think we need to keep by default the existing behaviour (ICMPv6 echo reply with unicast)
> > in case some setups use it, and use "enable_anycast_src" to change the behaviour 
> > according to RFC4942.
> 
> We try to extract the destination address and reuse it in the reply. The
> other system should not notice if it communicates with a unicast or
> anycast address. Am I missing something?

Ah, I guess you are hinting at the situation where you ping a pre-defined
anycast address and expect back a unicast address for discovering the unicast
address of a router e.g.? Ok, I see...

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